Quartz-mill.



H. P. RANDALL.

QUARTZ MILL.

APPLIOATION FILED JULY 30,1913.

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INVE/VOR biz/P040 fffi/m/uz ATTORNEYS COLUMBIA PLANODRQPH (20., WASHINGTON, D. c,

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H. P. RANDALL.

QUARTZ MILL.

APPLICATION TILED JULY so, 1913.

1,094,248. Patented Apr. 21, 1914. v

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ATTORNEYS COLUMBIA PLANDGRAPH co wAsmNu'roN, D. c.

HAROLD F. RANDALL, 0F TIFFIN, OHIO.

QUARTZ-MILL.

Specification of Letters Patent.

Patented Apr. 21, 191 1.

Application filed July 30, 1913. Serial No. 781,947.

To all whom it may concern:

Be it known that I, HAROLD F. RANDALL, a citizen of the United States, and a resident of Tifiin, in the county of Seneca and State of Ohio, have made certain new and useful Improvements in Quartz-Mills, of which the following is a specification,

My invention relates to improvements in grinding machines, more especially those designed to grind quartz or similar rock, and it consists in the combinations, constructions and arrangements herein described and claimed.

An object of my invention is to provide a device having shoes disposed on a frame which may be oscillated in a horizontal plane.

A further object of my invention is to provide a device of the type described in which the horizontal oscillating frame may have a vertical movement so as to ride over and crush larger pieces of the rock.

A further object of my invention is to provide a device of a comparatively simple nature, but which is highly efficient for the purpose for which it is intended.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings forming part of this application in which similar reference characters indicate like parts in the several views and in which Figure 1 is a vertical section through the device, Fig. 2 is a section along the line 22 of Fig. 1. Fig. 3 is a perspective view of the device, certain portions being broken away for the sake of clearness, and Fig. 4: is a plan view on a reduced scale showing the arrangement of the dies.

In carrying out my invention I provide a base portion 1 which is preferably made of concrete. A frame 2 is secured to this base portion and supports the driving mechanism. The latter may consist of any suitable mechanism for rotating the grinding machinery. In the present instance I have shown a drive pulley at 3 which is mounted on a shaft 4: in bearings 5. The shaft is provided with a bevel gear 6 which meshes with a large gear '7 disposed on the upper end 8 of the main drive shaft 8. The latter is mounted vertically and is provided with a thrust bearing: 9. The shaft 8 is provided with a slot 8 The shaft 8 enters a socket 1O formed by a number of radially extending frame members 10. Carried by the frame members 10 and arranged to ext-end through the slot 8 is a guide pin or bolt 11. Secured to the outer ends of the radially extending frame members is a cylindrical frame member 12. This frame member is suspended by means of rods 13 which pass through. brackets 14: carried by the cylindrical frame member 10. The rods 13 are provided with heads 13 at their lower ends and are adj ustably secured by means of nuts 18 at their upper ends to arms 15 carried by the shaft 8, these arms being braced by brace members 16. A cylindrical housing 17 surrounds the shaft 8, the radial frame members 10 being bent to extend over the housing, as clearly shown in Fig. 3. Secured to the bottom of the frame formed by the members 10 and 12 on opposite sides of the frame are the grinding shoes 18. These members extend from one frame member 10 to the adjacent frame member 10, and as stated above, there are two of these shoes on opposite sides of the device. The ends of the shoes are beveled as shown at 18 in Fig. 3. The shoes are designed to ride over dies such as those shown at 19 which are placed concentrically about the central axis of the driving shaft 8.

Disposed concentrically about the cylindrical frame member 12, and spaced therefrom, is a cylindrical screen 20, while outside of the screen is another cylindrical member 21 which forms an exterior casing, the space between the screen and the outer casing 21 constituting a runway or gutter.

On one side of the device is a hopper 22 which communicates with the space above the dies 19 as shown in Fig. 2. On the opposite side of the device is a discharge chute 23.

From the foregoing description of the various parts of the device the operation thereof may be readily understood.

In preparing the mill for work the frame which carries the shoes is raised slightly by adjusting the nuts 13 of the suspension rods 13 so that the shoes are slightly elevated above the bed. In some instances it may be necessary to balance the device with weights which are placed above the shoes in the space between the adjacent frame member 10. Power is applied to the drive pulley 3 by any suitable form of driving mechanism (not shown) so as to rotate the pulley. The material, consisting of broken rock and water, is fed by means of the hopper 22 upon the bed, which is formed by the dies. Owing to the loose suspension of the frame which carries the shoes, the frame will be oscillated by the contact of the shoes with the material, so that first one shoe will engage the material and then the other. This ac tion is permitted by the fact that the rods 13 will slide through the brackets 14. Thus when a comparatively large piece of rock is encountered, the shoe will rise upon and ride over it. The shoe upon the opposite side will be forced downwardly. It will thus be seen that both a crushing and grinding action takes place. The ground pulp passes out through the screen and into the runway or the gutter between the screen and the cylindrical casing member 21 and thence out through the chute 28.

I claim:

1. In a grinding device, a base, a vertical shaft mounted for rotation on said base, a frame carried by said shaft and having an oscillatory movement with respect thereto, said shaft being disposed centrally of said frame, a bed plate, and shoes rigidly secured to and carried by said frame on opposite sides of the shaft and movable toward and away from said bed plate during the oscillation of the frame.

2. In a grinding device, a base, a vertical shaft having a rectangular portion mounted for rotation on said base, said shaft being provided with a slot, a frame provided with a rectangular socket arranged to receive the rectangular portion of the shaft, means carried by the shaft for suspending the frame, shoes carried by said frame on opposite sides of said shaft, a bed carried by said base, dies disposed concentrically about said shaft, and means for feeding material between said dies and said shoes.

3. In a grinding device, a base, a vertical shaft having a rectangular portion mounted for rotation on said base, said shaft being provided with a slot, a frame provided with a rectangular socket arranged to receive the rectangular portion of the shaft, means carried by the shaft for suspending the frame, shoes carried by said frame on opposite sides of said shaft, a bed carried by said base, dies disposed concentrically about said shaft, means for feeding material between said dies and said shoes, and means for adjusting the distance between said shoes and said dies.

4. In a grinding device, a base, a vertical shaft having a rectangular portion mounted for rotation on said base, said shaft being provided with a longitudinal slot, a frame provided with a rectangular socket arranged to receive the rectangular portion of the shaft, pins carried by the frame arranged to project through said longitudinal slot, means carried by the shaft for suspending the frame, said means permitting an oscillatory movement of the frame With respect to the shaft, shoes carried by the frame on opposite sides of the shaft, a bed carried by said base, dies disposed concentrically to said shaft, and means for feeding material through said dies and said shoes.

HAROLD F. RANDALL. Wi tnesses RUSH ABBOTT, AUeUsrUs BECK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

